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Positron (other) , the fictional device conceived by Isaac Asimov
{{Disambiguation ...
A positron is an elementary particle of antimatter. Positron may also refer to: * ''Positron'' (video game), the 1983 video game published by Micro Power * Positron! Records, a Chicago-based independent record label * Positron Corporation, an American nuclear medicine healthcare company * "Positron", a 1993 trance track by Cygnus X * Positron, a bicycle shifting system from Shimano * Positron, a software development platform by Posit PBC See also * Positron emission, the radioactive decay * Positronic brain A positronic brain is a fictional technological device, originally conceived by science fiction writer Isaac Asimov. It functions as a central processing unit (CPU) for robots, and, in some unspecified way, provides them with a form of consciou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Positron
The positron or antielectron is the particle with an electric charge of +1''elementary charge, e'', a Spin (physics), spin of 1/2 (the same as the electron), and the same Electron rest mass, mass as an electron. It is the antiparticle (antimatter counterpart) of the electron. When a positron collides with an electron, annihilation occurs. If this collision occurs at low energies, it results in the production of two or more photons. Positrons can be created by positron emission radioactive decay (through weak interactions), or by pair production from a sufficiently energetic photon which is interacting with an atom in a material. History Theory In 1928, Paul Dirac published a paper proposing that electrons can have both a positive and negative charge. This paper introduced the Dirac equation, a unification of quantum mechanics, special relativity, and the then-new concept of electron Spin (physics), spin to explain the Zeeman effect. The paper did not explicitly predict a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Positron (video Game)
''Positron'' is a fixed shooter written by Gary Partis for the BBC Micro and Acorn Electron and published by Micro Power in 1983. It was developed on a pre-release Electron and was one of the few games (other than those produced by Acornsoft) available for the machine on its launch. Gameplay The first wave is similar to ''Space Invaders''. The player controls a laser base which can move left and right and fire vertically. The object of the game is to destroy all alien creatures on each screen, then proceed to the next. The first ''sheet'' (what the enemy waves are called) of aliens follows the ''Space Invaders'' style of moving left to right, then down one row before moving right to left. All subsequent sheets follow a pseudo-random formation, generally moving down the screen but at various speeds and with greatly varying levels of firepower for each individual enemy. This means the strategy must change to looking to find which enemies are descending fastest and picking them off ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Positron! Records
Positron Records is an independent record label based in Chicago, Illinois. The label was founded in 1998 by Chris Randall, frontman of the industrial band Sister Machine Gun. Positron describes itself as an "anti-label" because they release only a handful of albums and give as much support to each release as they can. The label also features a Creative Commons license for some of its albums, allowing individuals to upload those songs to peer-to-peer websites as well as sample parts of those songs for private or commercial usage. Artists * The Atomica Project * Bizarbies * Bounte * Eco-Hed * Chris Randall (under his own name and also as Micronaut) * S. Sturgis * Scanalyzer * Sister Machine Gun (and spin-off Amish Rake Fight) * Matt Walker (as Beautiful Assassins and also Impossible Recording Machine) Label compilations * ''Komposi001'' * ''Komposi002'' * ''Komposi003'' See also * List of record labels File:Alvinoreyguitarboogie.jpg File:AmMusicBunk78.jpg File:Bingola ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Positron Corporation
Positron Corporation is an American nuclear medicine healthcare company specializing in cardiac Positron Emission Tomography (PET) imaging. Positron is headquartered in Niagara Falls, New York in addition to its clinical and technical cardiovascular PET training facility. The company's products and services enable healthcare providers to diagnose cardiac disease and improve patient outcomes. Positron Corporation is a public company and traded on the Financial Industry Regulatory Authority, Inc.'s OTC Bulletin Board under the ticker symbol POSC. History Positron was founded in 1983 as a research and development company. Company development After its founding in 1983, Positron debuted a new time-of-flight tomograph called the POSICAM. Posicam used barium fluoride for the scintillation detector and was primarily used by researchers interested in cardiac imaging. In 1985, the FDA approved the POSICAM system for marketing and the following year, Positron began commercial operations. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cygnus X (music Group)
Cygnus X was a trance music project from Germany named after the famous X-ray binary star Cygnus X-1. It began as a collaboration between Matthias Hoffmann and Ralf Hildenbeutel, who later left. ''Discogs''. Retrieved on 17 January 2008. Other projects of the pair include A.C. Boutsen, Brainchild and Dee.FX. Their sound extends from hard to ambient trance. Their first release was "Superstring" in 1993. Their third trance track, "The Orange Theme", released in 1994, was the project's best received track, borrowing the melodic theme of 's classical composition " Music for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shimano
, originally and later , is a Japanese multinational corporation, multinational manufacturing company for cycling components, fishing tackle and rowing (sport), rowing equipment, which also produced golf supplies until 2005 and snowboarding gear until 2008. Named after founder Shozaburo Shimano (, 1894–1958) and headquartered in Sakai, Osaka, Sakai, Osaka Prefecture, the company has 32 consolidated and 11 unconsolidated subsidiaries, with the primary manufacturing plants based in Kunshan (China), Malaysia and Singapore. In 2017, Shimano had net sales of US dollar, US $3.2 billion, 38% in Europe, 35% in Asia, and 11% in North America. Bicycle components represented 80%, fishing tackle 19%, and other products 0.1%. The company is publicly traded, with 93 million shares of common stock outstanding. They are also the official neutral support for most of the UCI World Tour. Cycling Shimano sales constitute an estimated 85% of the global bicycle component market by value. Its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Posit PBC
Posit PBC (or Posit) is an open-source data science software company. It is a public-benefit corporation founded by J. J. Allaire, creator of the programming language ColdFusion. Posit has no formal connection to the R Foundation, a not-for-profit organization located in Vienna, Austria, which is responsible for overseeing development of the R environment for statistical computing. Posit was formerly known as RStudio Inc. In July 2022, it announced that it changed its name to Posit, to signify its broadening exploration towards other programming languages such as Python. History Before the company started, Allaire initially started RStudio, the integrated development environment (IDE), as an open source project. He recruited Joe Cheng to help work on this project, who would eventually become Posit's CTO. Moreover, Cheng would conceptualize and develop the Shiny web framework in 2012. In August 2012, Hadley Wickham, Winston Chang, and Garrett Grolemund joined Posit (at t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Positron Emission
Positron emission, beta plus decay, or β+ decay is a subtype of radioactive decay called beta decay, in which a proton inside a radionuclide nucleus is converted into a neutron while releasing a positron and an electron neutrino (). Positron emission is mediated by the weak force. The positron is a type of beta particle (β+), the other beta particle being the electron (β−) emitted from the β− decay of a nucleus. An example of positron emission (β+ decay) is shown with magnesium-23 decaying into sodium-23: : → + + Because positron emission decreases proton number relative to neutron number, positron decay happens typically in large "proton-rich" radionuclides. Positron decay results in nuclear transmutation, changing an atom of one chemical element into an atom of an element with an atomic number that is less by one unit. Positron emission occurs extremely rarely in nature on Earth. Known instances include cosmic ray interactions and the decay of certain isotopes, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
